It seems, when you’re in a vehicle, the teleport volume does some kind of raycast or shapecast, from the position you’re at when you teleport to the target position. If that collision check hits something, it teleports you to the first hit, rather than the target position.
If you’re on foot, the teleporter just sends you straight to the target position, which was also Gate’s expected behavior for vehicles.
This video shows how the vehicle gets sent to the closest collision, while on-foot characters are not. The teleporter pipe used has its target inside the pipe on the other side of the map. The canvas rugs here cause the scooter to only teleport a tiny distance, instead of to the opposing pipe, as any collider in the way will block the raycast.